About overtraining, how many times in a week do most people bike for fitness? Is cycling everyday pretty normal?
I can't speak for most people, but Garmin's training coach had me at 5 days a week (two rest days). The rest and recovery can be just as, if not more important, than the training!
But you could ride every day, with a few days being at higher intensity or intervals, and the others are either a recovery pace or "zone 2".